HTA / HTML help - How to clear a drop down list (remove ALL items)

I'm dynamically generating a table in my script code that creates a cell with a text box, using the following...

<INPUT TYPE=text NAME=txtTargetServer SIZE=25 OnKeyUp=""UpdateTargetServer"" onBlur=""UpdateTargetDrives"" TITLE=""Enter the target server name only."">

When the text value is entered, the onBlur event fires and the drop down (which calls a wmi query to get the server's volume) is correctly populated.
However, if I revisit that field and change the server, it's not properly clearing the options in the drop down.

As a test, I entered msgbox lines and it comes up as 0 for the length after the while/wend loop, but the data is still there - do I have to refresh the list somehow?

I've also tried this loop, which fails to ever hit (it's after the while/wend)
   For Each objOption in TargetVolumes.Options
       objOption.RemoveNode
    Next

msgbox TargetVolumes.Options.Length
  While TargetVolumes.Options.Length > 0
    TargetVolumes.Options.Remove(0)
  Wend
msgbox TargetVolumes.Options.Length

Select allOpen in new window